#include <sysexits.h>
#include <assert.h>
-/* #include dcpu16.h */
-typedef unsigned short DCPU16_WORD;
-
-/* quick and dirty assembler for dcpu16 */
+#include "as-dcpu16.h"
+
+/*
+ * quick and dirty assembler for dcpu16
+ *
+ * Justin Wind <justin.wind@gmail.com>
+ * 2012 04 07 - implementation started
+ * 2012 04 10 - functional
+ *
+ * TODO
+ * needs ability to specify location for code or data
+ */
static const char * const src_id_ = "$Id$";
const char const out_filename_default_[] = "a.out";
+unsigned int verbose_ = 0;
+unsigned int dryrun_ = 0;
+
+
+#define DEBUG_PRINTF(...) do { if (verbose_ > 2) printf(__VA_ARGS__); } while (0)
+#define VERBOSE_PRINTF(...) do { if (verbose_) printf(__VA_ARGS__); } while (0)
+
static
void usage_(char *prog, unsigned int full) {
fprintf(f, "%s -- \n\n",
prog);
- fprintf(f, "Usage: %s\n",
+ fprintf(f, "Usage: %s [-h] [-v] [-s] [-o file] file [file [...]]\n",
prog);
if (full) {
fprintf(f, "\nOptions:\n"
"\t-h -- this screen\n"
- "\t-o <file> -- output to <file> [default: %s]\n",
+ "\t-o <file> -- output to <file> [default: %s]\n"
+ "\t-s -- allow short labels in instruction words\n"
+ "\t-d -- dry run, print results, do not write to file\n"
+ "\t-v -- verbose output\n",
out_filename_default_);
fprintf(f, "\n%78s\n",
}
}
-struct operand_ {
- struct operand_ *next;
- char *operand;
-};
-struct instruction_ {
- struct instruction_ *next;
- char *label;
- char *opcode;
- struct operand_ *operands;
+/* maintain an array of the instructions we have parsed */
+static
+struct instruction_list_ *instr_list_new(void) {
+ size_t init_size = 1024;
+ struct instruction_list_ *il = malloc(IL_SIZE(init_size));
+ if (il == NULL) {
+ fprintf(stderr, "%s():%s\n", "malloc", strerror(errno));
+ return NULL;
+ }
+ il->allocated = init_size;
+ il->entries = 0;
+ return il;
+}
+
+static
+int instr_list_insert(struct instruction_list_ **il, struct instruction_ *i) {
+ /* make room make room */
+ if ((*il)->entries - 1 == (*il)->allocated) {
+ size_t new_allocated = (*il)->allocated + 1024;
+ void *tmp_ptr = realloc(*il, IL_SIZE(new_allocated));
+ if (tmp_ptr == NULL) {
+ fprintf(stderr, "%s():%s\n", "realloc", strerror(errno));
+ return -1;
+ }
+ *il = tmp_ptr;
+ (*il)->allocated = new_allocated;
+ }
+
+ (*il)->instr[(*il)->entries] = i;
+ (*il)->entries += 1;
+ return 0;
+}
+
+/* also maintain a list of the labels we've seen, indexed back to their instructions. */
+/* FIXME: ugh, this could all stand to be rewritten cleaner */
+/* these lists could be rearranged to be a lot easier to wrangle and/or maybe use common interfaces */
+/* they were thrown together on the fly */
+static
+struct label_list_ *label_list_new(void) {
+ size_t init_size = 256;
+ struct label_list_ *ll = malloc(LL_SIZE(init_size));
+ if (ll == NULL) {
+ fprintf(stderr, "%s():%s\n", "malloc", strerror(errno));
+ return NULL;
+ }
+ ll->allocated = init_size;
+ ll->entries = 0;
+ return ll;
+}
+
+/* instr here is index into instruction list */
+static
+int label_list_insert(struct label_list_ **ll, struct instruction_ **instr) {
+ if ((*ll)->entries - 1 == (*ll)->allocated) {
+ size_t new_allocated = (*ll)->allocated + 256;
+ void *tmp_ptr = realloc(*ll, IL_SIZE(new_allocated));
+ if (tmp_ptr == NULL) {
+ fprintf(stderr, "%s():%s\n", "realloc", strerror(errno));
+ return -1;
+ }
+ *ll = tmp_ptr;
+ (*ll)->allocated = new_allocated;
+ }
+
+ DEBUG_PRINTF("TRACE: adding label '%s'\n", (*instr)->label);
+
+ (*ll)->label[(*ll)->entries].label = (*instr)->label;
+ (*ll)->label[(*ll)->entries].instr = instr;
+ (*ll)->entries += 1;
+ return 0;
+}
+
+/* locate the index of a labelled instruction within the instruction list */
+static
+struct instruction_ **label_list_find_instr(struct label_list_ *ll, char *label) {
+ size_t x;
+
+ for (x = 0; x < ll->entries; x++) {
+ if (strcmp(ll->label[x].label, label) == 0)
+ return ll->label[x].instr;
+ }
+ return NULL;
+}
+
+/* look up the address of a calculated address */
+static
+int label_list_find_addr(struct label_list_ *ll, char *label, DCPU16_WORD *addr) {
+ size_t x;
+
+ for (x = 0; x < ll->entries; x++) {
+ if (strcmp(ll->label[x].label, label) == 0) {
+ if (ll->label[x].ready == 1) {
+ *addr = ll->label[x].addr;
+ return 0;
+ }
+ }
+ }
+ return -1;
+}
+
+/* attempt to determine the addresses of labels */
+static
+void label_addr_calculate_(struct instruction_list_ *il, struct label_list_ *ll) {
+ size_t i;
+
+ /* walk through labels */
+ for (i = 0; i < ll->entries; i++) {
+ struct instruction_ **instr;
+ unsigned int word_count = 0;
+
+ if (ll->label[i].ready)
+ continue;
+
+ /*
+ * walk backwards through the list of instructions
+ * until we get to the start or a known prior label address
+ * update our label
+ */
+ for (instr = ll->label[i].instr; instr >= il->instr; instr--) {
+
+ word_count += (*instr)->length;
+
+ if ((*instr)->label
+ && strcmp((*instr)->label, ll->label[i].label)) {
+ DCPU16_WORD addr;
+
+ if (label_list_find_addr(ll, (*instr)->label, &addr)) {
+ fprintf(stderr, "internal error: incomplete prior address for '%s' while calculating '%s'\n",
+ (*instr)->label,
+ ll->label[i].label);
+ continue;
+ }
+ word_count += addr;
+ break;
+ }
+ }
+ ll->label[i].addr = word_count;
+ ll->label[i].ready = 1;
+ DEBUG_PRINTF("label '%s' has addr of 0x%04x\n", ll->label[i].label, word_count);
+ }
+}
+
+static
+void instr_free_(struct instruction_ *i) {
+ if (i->label)
+ free(i->label);
+ if (i->opcode)
+ free(i->opcode);
+ while (i->operands) {
+ struct operand_ *o = i->operands;
+
+ i->operands = o->next;
+ free(o);
+ }
+
+ free(i);
+}
+
+/* generate the nibble for a given basic opcode */
+static
+int opcode_bits_(char *opcode) {
+ static struct {
+ char op[4];
+ char value;
+ } opcodes_lower_nibble[] = {
+ { "JSR", 0x00 },
+ /* { "future nbi instruction", 0x00 }, */
+ { "SET", 0x01 },
+ { "ADD", 0x02 },
+ { "SUB", 0x03 },
+ { "MUL", 0x04 },
+ { "DIV", 0x05 },
+ { "MOD", 0x06 },
+ { "SHL", 0x07 },
+ { "SHR", 0x08 },
+ { "AND", 0x09 },
+ { "BOR", 0x0a },
+ { "XOR", 0x0b },
+ { "IFE", 0x0c },
+ { "IFN", 0x0d },
+ { "IFG", 0x0e },
+ { "IFB", 0x0f },
+ { "", 0x00 }
+ }, *o;
+
+ for (o = opcodes_lower_nibble; o->op[0]; o++) {
+ if (strcasecmp(o->op, opcode) == 0)
+ break;
+ }
+
+ if (o->op[0] == '\0') {
+ fprintf(stderr, "unknown instruction '%s'\n", opcode);
+ return -1;
+ }
+
+ return o->value;
+}
+
+/* generate the six bits for a given nbi opcode (aka first operand to opcode 0x00) */
+static
+int nbi_opcode_bits_(char *nbi_opcode) {
+ static struct {
+ char op[4];
+ char value;
+ } nbi_opcodes_bits[] = {
+ { " ", 0x00 }, /* reserved for future */
+ { "JSR", 0x01 },
+ { "", 0x00 }
+ }, *o;
+
+ for (o = nbi_opcodes_bits; o->op[0]; o++) {
+ if (strcasecmp(o->op, nbi_opcode) == 0)
+ break;
+ }
+
+ if (o->op[0] == '\0') {
+ fprintf(stderr, "unknown nbi instruction '%s'\n", o->op);
+ return -1;
+ }
+
+ return o->value;
+}
+
+/* convert register character like 'x' to value like 0x03 */
+static inline
+unsigned int register_enumerate_(char r) {
+ const char regs[] = "AaBbCcXxYyZzIiJj";
+ const char *x = strchr(regs, r);
+
+ if (x)
+ return (x - regs)/2;
+
+ fprintf(stderr, "internal error, unknown register character 0x%02x\n", r);
+ return -1;
+}
+
+/* removes all occurences of chars from buf */
+static inline
+void buf_strip_chars_(char *buf, char *chars) {
+ char *s, *d;
+
+ for (s = d = buf; *s; s++, d++) {
+ while (*s && strchr(chars, *s)) {
+ s++;
+ }
+ if (!*s)
+ break;
+ *d = *s;
+ }
+ *d = *s;
+}
+
+/* value_bits_
+ * generate the six bits for a given operand string
+ * returns -1 if it could not parse the operand
+ * returns -2 if it could not parse the operand due to an unresolved label
+ * notes: nextword may be overwritten even if it's not used in final instruction
+ */
+static
+int value_bits_(struct label_list_ *ll, char *operand_orig, DCPU16_WORD *nextword, unsigned int *nextwordused, unsigned int allow_short_labels) {
+ static char *operand = NULL;
+ static size_t operand_sz = 0;
+
+ unsigned long l;
+ char *o, *ep;
+
+ /*
+ Our operand working buffer shouldn't ever need to be too big,
+ but DAT might blow that assumption.
+ */
+ if (operand_sz <= strlen(operand_orig)) {
+ void *tmp_ptr;
+ size_t new_sz = strlen(operand_orig);
+
+ if (new_sz < 256)
+ new_sz = 256;
+ new_sz += 256;
+
+ DEBUG_PRINTF("%s: allocating buffer of size %zu\n", __func__, new_sz);
+ tmp_ptr = realloc(operand, new_sz);
+ if (tmp_ptr == NULL) {
+ fprintf(stderr, "%s(%zu):%s\n", "realloc", new_sz, strerror(errno));
+ return -1;
+ }
+ operand = tmp_ptr;
+ operand_sz = new_sz;
+ }
+
+ o = strcpy(operand, operand_orig);
+
+ DEBUG_PRINTF("%s: operand '%s' ", __func__, operand); /* completed later */
+
+ /* this is a very stupid parser */
+
+ /* first, let's trim all whitespace out of string at once to make parsing easier */
+ buf_strip_chars_(operand, " \t\n");
+
+ /* single character might match a register */
+ if (strlen(operand) == 1
+ && strchr("AaBbCcXxYyZzIiJj", *operand)) {
+ DEBUG_PRINTF("is register %c\n", *operand);
+ return register_enumerate_(*operand);
+ }
+
+ /* easy matches */
+ if (strcasecmp(operand, "POP") == 0) {
+ DEBUG_PRINTF("is POP\n");
+ return 0x18;
+ }
+ if (strcasecmp(operand, "PUSH") == 0) {
+ DEBUG_PRINTF("is PUSH\n");
+ return 0x19;
+ }
+ if (strcasecmp(operand, "PEEK") == 0) {
+ DEBUG_PRINTF("is PEEK\n");
+ return 0x1a;
+ }
+ if (strcasecmp(operand, "SP") == 0) {
+ DEBUG_PRINTF("is register SP\n");
+ return 0x1b;
+ }
+ if (strcasecmp(operand, "PC") == 0) {
+ DEBUG_PRINTF("is register PC\n");
+ return 0x1c;
+ }
+ if (strcasecmp(operand, "O") == 0) {
+ DEBUG_PRINTF("is register O\n");
+ return 0x1d;
+ }
+
+ /* is the operand [bracketed]? */
+ if (operand[0] == '[' && operand[strlen(operand) - 1] == ']') {
+ /* eat the brackets */
+ operand[strlen(operand) - 1] = '\0';
+ operand++;
+
+ /* is it [register]? */
+ if (strlen(operand) == 1
+ && strchr("AaBbCcXxYyZzIiJj", *operand)) {
+ DEBUG_PRINTF("is dereferenced register %c\n", *operand);
+ return 0x08 | register_enumerate_(*operand);
+ }
+
+ /* is it [register+something]? */
+ if ( (ep = strchr(operand, '+')) ) {
+ char *reg;
+ char *constant;
+
+ /* eat the plus */
+ *ep = '\0';
+ ep++;
+
+ /* figure out which one is which */
+ if (strlen(ep) == 1
+ && strchr("AaBbCcXxYyZzIiJj", *ep)) {
+ reg = ep;
+ constant = operand;
+ } else if (strlen(operand) == 1
+ && strchr("AaBbCcXxYyZzIiJj", *operand) ) {
+ reg = operand;
+ constant = ep;
+ } else {
+ DEBUG_PRINTF("is unparsable\n");
+ fprintf(stderr, "couldn't parse operand '%s'\n", operand_orig);
+ return -1;
+ }
+
+ /* check if something is understandable as a value */
+ errno = 0;
+ l = strtoul(constant, &ep, 0);
+ if (errno == 0
+ && (*constant && (*ep == '\0')) ) {
+ /* string conversion went without issue */
+ /* validate it will fit in a word */
+ if (l > 0xffff) {
+ DEBUG_PRINTF("is out of range\n");
+ fprintf(stderr, "constant invalid in operand '%s'\n", operand_orig);
+ return -1;
+ }
+
+ /* seems fine */
+ *nextword = l & 0xffff;
+ *nextwordused += 1;
+ DEBUG_PRINTF("is a dereferenced register (%c) + constant (%hu)\n", *reg, *nextword);
+ return 0x10 | register_enumerate_(*reg);
+ } else if (errno) {
+ DEBUG_PRINTF("is out of range\n");
+ fprintf(stderr, "trouble with operand '%s': %s\n", operand_orig, strerror(errno));
+ return -1;
+ }
+
+ /* what? still here? assume it's a label, I guess */
+ /* try to populate nextword with label address */
+ if (label_list_find_addr(ll, operand, nextword)) {
+ DEBUG_PRINTF("(deferred label resolution)\n");
+ *nextwordused += 1;
+ return -2;
+ }
+ DEBUG_PRINTF("is a dereferenced register (%c) + label\n", *reg);
+ *nextwordused += 1;
+ return 0x10 | register_enumerate_(*reg);
+ }
+
+ /* it must just be a dereferenced literal then */
+
+ errno = 0;
+ l = strtoul(operand, &ep, 0);
+ if (errno == 0
+ && (*operand && (*ep == '\0')) ) {
+ /* string conversion went without issue */
+ /* validate it will fit in a word */
+ if (l > 0xffff) {
+ DEBUG_PRINTF("is out of range\n");
+ fprintf(stderr, "constant invalid in operand '%s'\n", operand_orig);
+ return -1;
+ }
+
+ DEBUG_PRINTF("is a dereferenced literal value (%hu)\n", *nextword);
+ *nextword = l & 0xffff;
+ *nextwordused += 1;
+ return 0x1e;
+ } else if (errno) {
+ DEBUG_PRINTF("is out of range\n");
+ fprintf(stderr, "trouble with operand '%s': %s\n", operand_orig, strerror(errno));
+ }
+
+ /* not a number? try a label */
+ if (label_list_find_addr(ll, operand, nextword)) {
+ DEBUG_PRINTF("(deferred label resolution)\n");
+ *nextwordused += 1;
+ return -2;
+ }
+ DEBUG_PRINTF("is a dereferenced label\n");
+ *nextwordused += 1;
+ return 0x1e;
+ }
+
+ /* left with a literal or a label, then */
+
+ errno = 0;
+ l = strtoul(operand, &ep, 0);
+ if (errno == 0
+ || (*operand && (*ep == '\0')) ) {
+ if (l > 0xffff) {
+ DEBUG_PRINTF("is out of range\n");
+ fprintf(stderr, "constant invalid in operand '%s'\n", operand_orig);
+ return -1;
+ }
+
+ DEBUG_PRINTF("is literal value (%lu)\n", l);
+ if (l < 0x20) {
+ return l + 0x20;
+ }
+
+ *nextword = l & 0xffff;
+ *nextwordused += 1;
+ return 0x1f;
+ }
+
+ /* try to populate nextword with label address */
+ if (label_list_find_addr(ll, operand, nextword)) {
+ DEBUG_PRINTF("(deferred label resolution)\n");
+ /* assume non-small literal value */
+ *nextwordused += 1;
+ return -2;
+ }
+
+ DEBUG_PRINTF("is label '%s' (0x%02hx)\n", operand, *nextword);
+ if (*nextword < 0x20 && allow_short_labels) {
+ DEBUG_PRINTF("small value label win\n");
+ return (0x20 + *nextword) & 0x3f;
+ }
+
+ *nextwordused += 1;
+ return 0x1f;
+}
+
+static inline
+int instruction_print_(struct instruction_ *i, unsigned int with_label) {
+ struct operand_ *o;
+ int r;
+
+ if (with_label)
+ r = printf("%-16s %3s", i->label ? i->label : "", i->opcode);
+ else
+ r = printf("%3s", i->opcode);
- unsigned int length; /* words */
- DCPU16_WORD instr_words[];
-};
+ for (o = i->operands; o; o = o->next)
+ r += printf(" %s%s", o->operand, o->next ? "," : "");
+ return r;
+}
+
+/* parse an instruction out of buf, create new instruction struct if seemingly valid */
+/* does not actually check if instruction is valid yet */
/* buf must be 0-terminated */
static
int buf_tokenize_(char *buf, struct instruction_ **next_instr) {
*x = '\0';
/* kill leading whitespace */
buf += strspn(buf, " \t\n");
- /* kill trailing newlines */
+ /* kill trailing whitespace */
+ if (*buf) {
+ x = buf + strlen(buf);
+ while (strchr(" \t\n", *x)) {
+ *x = '\0';
+ x--;
+ }
+ }
+
if ((x = strrchr(buf, '\n')) != NULL)
*x = '\0';
if (x == NULL)
return 0;
+#ifdef OTHER_LABELS
/* labels end with :, otherwise its an opcode */
- if ((y = strrchr(x, ':')) != NULL) {
+ y = x + strlen(x) - 1;
+ if (*y == ':') {
*y = '\0';
label = x;
opcode = strtok_r(NULL, sep, &st);
+ }
+#else /* OTHER_LABELS */
+ /* labels.. begin? with ':' ? okay, I guess. Whatever. */
+ /* otherwise, it's an opcode */
+ if (*x == ':') {
+ label = x + 1;
+ opcode = strtok_r(NULL, sep, &st);
} else {
label = NULL;
opcode = x;
}
+#endif /* OTHER_LABELS */
if (opcode) {
operand = st;
}
- instr = calloc(1, sizeof *instr);
+ /* extra room for assembled words */
+ instr = calloc(1, 3 + sizeof *instr);
if (instr == NULL) {
- fprintf(stderr, "%s():%s\n", "malloc", strerror(errno));
+ fprintf(stderr, "%s():%s\n", "calloc", strerror(errno));
return -1;
}
- instr->label = label;
- instr->opcode = opcode;
+ instr->label = label ? strdup(label) : NULL;
+ instr->opcode = opcode ? strdup(opcode) : NULL;
if (operand) {
-
+ struct operand_ **o_next = &instr->operands;
+
+ for (x = strtok_r(operand, ",", &st);
+ x;
+ x = strtok_r(NULL, ",", &st) ) {
+ *o_next = malloc(3 + sizeof **o_next); /* FIXME: handle this on the fly later */
+
+ if (*o_next == NULL) {
+ fprintf(stderr, "%s():%s\n", "calloc", strerror(errno));
+ instr_free_(instr);
+ return -1;
+ }
+
+ /* trim */
+ x += strspn(x, " \t\n");
+ if (*x) {
+ y = x + strlen(x) - 1;
+ while (strchr(" \t\n", *y)) {
+ *y = '\0';
+ y--;
+ }
+ }
+
+ (*o_next)->operand = strdup(x);
+ (*o_next)->next = NULL;
+ o_next = &((*o_next)->next);
+ }
}
*next_instr = instr;
return 0;
}
-/* thish should grow buffer to fit huge linesh, but I jusht don't care right now, hic */
+/* try to generate bytecode for an instruction */
static
-int parse_stream_(FILE *f) {
- struct instruction_ *instr;
- char buf[(1<<14)];
+int instr_assemble_(struct label_list_ *ll, struct instruction_ *i, unsigned int allow_short_labels) {
+ unsigned int nwu = 0; /* number of words used */
+ unsigned int incomplete = 0;
+ int bits;
+ struct operand_ *o = i->operands;
+
+ if (verbose_ > 2) {
+ printf("%s: assembling ", __func__);
+ instruction_print_(i,1);
+ printf("\n");
+ }
+
+ if (i->ready) {
+ /* already assembled, nothing to do */
+ return 0;
+ }
+
+ /* special case DAT */
+ if (strncasecmp(i->opcode, "DAT", 3) == 0) {
+ /* just dump operands into words, I guess */
+ fprintf(stderr, "FIXME unhandled raw data\n");
+ /* count total length of data.. */
+ /* realloc instruction */
+ /* populate words */
+ return 0;
+ }
+
+ /* start with opcode bits */
+ bits = opcode_bits_(i->opcode);
+ if (bits < 0) {
+ fprintf(stderr, "unrecognized instruction '%s%s", i->opcode, i->operands ? " " : "");
+ for (o = i->operands; o; o = o->next)
+ fprintf(stderr, " %s%s", o->operand, o->next ? "," : "");
+ fprintf(stderr, "'\n");
+ return -1;
+ }
+ i->instr_words[0] |= 0x0f & bits;
+
+ /* in rendered bytecode, all instructions have two operands; nbi instructions take 'first operand' bits. */
+ if ((bits & 0x0f) == 0) {
+ bits = nbi_opcode_bits_(i->opcode);
+ if (bits < 0) {
+ fprintf(stderr, "INTERNAL ERROR: missing instruction in nbi opcode table\n");
+ exit(EX_SOFTWARE);
+ }
+ } else {
+ if (o == NULL) {
+ fprintf(stderr, "'%s' requires more operands\n", i->opcode);
+ return -1;
+ }
+ bits = value_bits_(ll, o->operand, i->instr_words + 1, &nwu, allow_short_labels);
+ if (bits == -1) {
+ fprintf(stderr, "couldn't assemble instruction\n");
+ return -1;
+ } else if (bits == -2) {
+ DEBUG_PRINTF("%s: assembly deferred: unresolved label\n", __func__);
+ /* keep going, but don't finalize until we can calculate label address */
+ incomplete = 1;
+ bits = 0;
+ }
+ o = o->next;
+ }
+ i->instr_words[0] |= (bits & 0x3f) << 4;
+
+ if (o == NULL) {
+ fprintf(stderr, "'%s' requires more operands\n", i->opcode);
+ return -1;
+ }
+
+ bits = value_bits_(ll, o->operand, i->instr_words + nwu + 1, &nwu, allow_short_labels);
+ if (bits == -1) {
+ fprintf(stderr, "couldn't assemble instruction\n");
+ return -1;
+ } else if (bits == -2) {
+ DEBUG_PRINTF("%s: assembly deferred: unresolved label\n", __func__);
+ /* keep going, but don't finalize until we can calculate label address */
+ incomplete = 1;
+ bits = 0;
+ }
+ o = o->next;
+ i->instr_words[0] |= (bits & 0x3f) << 10;
+
+ if (o != NULL) {
+ fprintf(stderr, "too many operands\n");
+ return -1;
+ }
+
+ /* counting labels as words, we now know at least the maximum instruction length */
+
+ i->length = nwu + 1;
+
+ DEBUG_PRINTF("instruction words: [%u]", i->length);
+ for (bits = 0; bits <= (int)nwu; bits++)
+ DEBUG_PRINTF(" %04x", i->instr_words[bits]);
+
+ if (incomplete) {
+ DEBUG_PRINTF(" (preliminary)");
+ } else {
+ i->ready = 1;
+ }
+
+ DEBUG_PRINTF("\n");
+
+ return 0;
+}
+
+/* parse_stream_
+ * read lines from stream f
+ * break each line into parts, populate parts into structures
+ */
+static
+int parse_stream_(FILE *f, const char *src, struct instruction_list_ **il, struct label_list_ **ll, unsigned int allow_short_labels) {
+ struct instruction_ *instr, **instr_list_entry;
+ unsigned int line = 0;
+ int retval = 0;
+ char buf[0x4000];
buf[sizeof buf - 1] = '\0';
while (fgets(buf, sizeof buf, f)) {
+ line++;
+
if (buf[sizeof buf - 1] != '\0') {
- fprintf(stderr, "input buffer exhausted\n");
+ fprintf(stderr, "%s:%u:%s", src, line, "input line too long\n");
+ retval = -1;
break;
}
if (buf_tokenize_(buf, &instr)) {
- fprintf(stderr, "trouble tokenizing input\n");
+ fprintf(stderr, "%s:%u:%s", src, line, "trouble tokenizing input\n");
+ retval = -1;
break;
}
if (instr) {
- struct operand_ *o;
- if (instr->label) {
- printf("TRACE: new label '%s'\n", instr->label);
+ /* add to list of instructions */
+ if (instr_list_insert(il, instr)) {
+ fprintf(stderr, "%s:%u:%s", src, line, "could not populate instruction list\n");
}
- printf("TRACE: tokenized opcode:%s operands:",
- instr->opcode);
- for (o = instr->operands; o; o = o->next) {
- printf("%s%s", o->operand, o->next ? ", " : "");
- }
- printf("\n");
+ instr_list_entry = (*il)->instr + (*il)->entries - 1;
+ if (instr->label) {
+ if (label_list_find_instr(*ll, instr->label)) {
+ fprintf(stderr, "%s:%u:%s", src, line, "duplicate label\n");
+ break;
+ }
+ if (label_list_insert(ll, instr_list_entry)) {
+ fprintf(stderr, "%s:%u:%s", src, line, "could not populate label list\n");
+ }
+ label_addr_calculate_(*il, *ll);
+ }
- /* add to queue of instructions */
+ instr_assemble_(*ll, instr, allow_short_labels);
}
}
if (ferror(f)) {
return -1;
}
+ return retval;
+}
+
+/* assemble_check_
+ * make a full pass over instruction list to resolve labels
+ */
+static
+int assemble_check_(struct instruction_list_ *il, struct label_list_ *ll, unsigned int allow_short_labels) {
+ int retval = 0;
+ size_t x;
+
+ DEBUG_PRINTF(" final pass of assembler...\n");
+ for (x = 0; x < il->entries; x++) {
+ retval |= instr_assemble_(ll, il->instr[x], allow_short_labels);
+ if (retval) {
+ fprintf(stderr, "instruction failed to assemble\n");
+ }
+ }
+
+ VERBOSE_PRINTF("%3s %6s %-32s %-4s\n", "", "_addr_", "_label_", "_instruction_");
+ for (x = 0; x < ll->entries; x++) {
+ if (! ll->label[x].ready)
+ retval |= -1;
+ if (verbose_) {
+ printf("%3s0x%04x %-32s ",
+ ll->label[x].ready ? "" : "*",
+ ll->label[x].addr,
+ ll->label[x].label);
+ instruction_print_(*(ll->label[x].instr), 0);
+ printf("\n");
+ }
+ }
+
+ VERBOSE_PRINTF("\n");
+
+ if (retval)
+ fprintf(stderr, "some labels could not be resolved\n");
+
+ return retval;
+}
+
+static
+int output_(struct instruction_list_ *il, const char *filename) {
+ FILE *of = NULL;
+ struct instruction_ *instr;
+ size_t i, r, total_words = 0;
+ size_t x;
+
+ if (! dryrun_) {
+ of = fopen(filename, "w");
+ if (of == NULL) {
+ fprintf(stderr, "%s('%s'):%s\n", "fopen", filename, strerror(errno));
+ return -1;
+ }
+ }
+
+ for (i = 0; i < il->entries; i++) {
+ instr = il->instr[i];
+
+ if (verbose_) {
+ int s;
+ s = instruction_print_(instr, 1);
+ printf("%*s;", (44 - s) > 0 ? (44 - s) : 0, "");
+ for (x = 0; x < instr->length; x++) {
+ printf(" %04x", instr->instr_words[x]);
+ }
+ printf("\n");
+ }
+
+ if (of) {
+ r = fwrite(instr->instr_words, sizeof(DCPU16_WORD), instr->length, of);
+ if (r < instr->length) {
+ fprintf(stderr, "%s():%s\n", "fwrite", strerror(errno));
+ return -1;
+ }
+ }
+ total_words += instr->length;
+ }
+
+ fprintf(stderr, "%s 0x%04zx instructions as 0x%04zx words\n",
+ dryrun_ ? "assembled" : "wrote",
+ i,
+ total_words);
+
return 0;
}
+static struct instruction_list_ *il_;
+static struct label_list_ *ll_;
+
int main(int argc, char *argv[]) {
const char *out_filename = NULL;
+ unsigned int allow_short_labels = 0;
int c;
- while ( (c = getopt(argc, argv, "ho:")) != EOF ) {
+ while ( (c = getopt(argc, argv, "dhsvo:")) != EOF ) {
switch (c) {
+ case 'd':
+ dryrun_++;
+ break;
+
+ case 's':
+ allow_short_labels++;
+ break;
+
case 'o':
if (out_filename) {
fprintf(stderr, "Sorry, I can only write one file at a time.\n");
out_filename = optarg;
break;
+ case 'v':
+ verbose_++;
+ break;
+
case 'h':
usage_(argv[0], 1);
exit(EX_OK);
}
}
+ argc -= optind;
+ argv += optind;
+
if (out_filename == NULL)
out_filename = out_filename_default_;
+ /* init tables */
+ il_ = instr_list_new();
+ ll_ = label_list_new();
+
/* if filenames were specified, parse them instead of stdin */
- if (argc - optind) {
- while (argc - optind) {
- FILE *f = fopen(argv[argc - optind], "r");
+ if (argc) {
+ while (argc) {
+ char *filename = *argv;
+ FILE *f = fopen(filename, "r");
+
+ argc--, argv++;
+
if (f == NULL) {
- fprintf(stderr, "%s('%s'):%s\n", "fopen", argv[argc - optind], strerror(errno));
- optind++;
+ fprintf(stderr, "%s('%s'):%s\n", "fopen", filename, strerror(errno));
continue;
}
- parse_stream_(f);
+ VERBOSE_PRINTF("assembling '%s'...\n", filename);
+ parse_stream_(f, filename, &il_, &ll_, allow_short_labels);
fclose(f);
-
- optind++;
}
} else {
- parse_stream_(stdin);
+ VERBOSE_PRINTF("assembling '%s'...\n", "stdin");
+ parse_stream_(stdin, "-", &il_, &ll_, allow_short_labels);
+ }
+
+ if (assemble_check_(il_, ll_, allow_short_labels)) {
+ fprintf(stderr, "errors prevented assembly\n");
+ exit(EX_DATAERR);
+ }
+
+ if (output_(il_, out_filename)) {
+ fprintf(stderr, "failed to create output\n");
+ exit(EX_OSERR);
}
exit(EX_OK);
projects / dcpu16 / blobdiff